Just wanted to put that out there and wondered if anyone else felt the same?
In my own case, my STBXH was an OK DH. He was generous and open and loyal. We had a good sex life. We laughed a lot. He had some major shortcomings but the good stuff more than made up for it.
But he has proved to be a disappointing father. He loves the DC but often treats them like an inconvenience - short tempered and selfish, often inattentive and disengaged. Occasionally bordering on cruel in word and deed 
. Not intentionally cruel, but thoughtless, ill considered words and deeds. At his worst he has hit them, sworn at them and left them alone as small DC whilst popping to the shop. He refuses to change or acknowledge any problem.
I left him, of course. My children are better off living with just me. I am glad I had the sense to do it. My DC are much happier.
But I am lonely and I still sometimes find myself in deep grief for what we once had. I don't regret having the DC even though single parenting is exhausting. I don't want to be back in my marriage now I have seen his true colours. I just sometimes wonder if things would have been different had we not had the DC.
Or maybe, just maybe, they have saved me from a mediocre marriage and there is a bright future, and a much better man around the corner for me. I bloody hope so.